IR Satellite

 

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Special Weather Alert: A vigorous tropical wave is approaching the Eastern Caribbean and should result in increased cloudiness across St.Vincent and the Grenadines (SVG) tonight with scattered showers. Although some degeneration has occurred within the tropical wave structure, interaction with the Inter-Tropical Convergence Zone (ITCZ) could cause moderate to heavy showers, periods of rain, thunderstorms and occasional gusty winds, peaking Thursday afternoon into the night.

The High Pressure System is dominant across the islands with patchy concentrations of Saharan dust (20 - 40 ug/m3) of varying intensity. A lower-level trough is expected to affect the Leewards and northern Windwards tonight which may spread a few shallow showers across our islands.  A vigorous tropical wave is expected to approach the Windward Islands bringing increased cloudiness across St.Vincent and the Grenadines (SVG) by Wednesday afternoon

The High Pressure System is rebuilding just north of our area across the Atlantic Ocean. There is sufficient moisture with cloud patches at lower levels, converging on its southern edge to bring some showers across our islands. Meanwhile, hazy conditions are thickening with poor visibility and air quality expected... Small craft operators and persons with respiratory concerns should note that moderate to thick haze

The axis of a relatively dry trough is crossing the island chain and mid level moisture is expected to gradually increase as another tropical wave moves closer. Mid to upper levels should support scattered showers and isolated thunderstorm activity during Friday.

Lower level moisture ahead of a weak tropical wave is moving across the region with a few scattered showers. However the environment around its axis is relatively dry and expected to cross with little shower activity overnight into Thursday. Meanwhile, slight hazy conditions should be thinned with improved visibility.

The Atlantic High Pressure System is rebuilding and pumping moderate to fresh (25 - 40km/h) breeze across the area. Small cloud patches in the lower levels could bring occasional showers. Meanwhile, increasing concentrations of Saharan dust (20 - 50 µg/m3) are expected to create slight to moderate hazy conditions, possibly thinning out on Thursday.

A tropical wave is crossing the Easter Caribbean and occasional support from mid to upper level features, are enhancing showers and thunderstorm activity. Cloudiness and shower activity should be generally decreased during Monday, but lower level cloud patches could bring occasional showers alternating with concentrations of slight to moderate (20 - 50 µg/m3) Saharan dust.

Haze is thinning out and should be cleared during Saturday as the next tropical wave approaches the islands. Moisture and showers should gradually increase towards evening, with instability peaking during the night/early morning Sunday. Mid to upper level features are expected to support showers and scattered thunderstorm activity. Shower activity should be decreased during Monday morning followed by a patch of Saharan dust

The Atlantic High Pressure System is rebuilding across the area and pumping fresh easterly breeze across our islands, while transporting Sahara dust concentrations to significantly reduce visibility and air quality…Small craft operators and persons with respiratory concerns should note that thick haze with PM2.5 levels near 52µg/m3 and PM10 levels near 74µg/m3 are expected across our area today.  

Unstable conditions with showers accompanied by gusty winds (up to 55km/h) and scattered thunderstorm activity can be expected on Wednesday as a wind/moisture surge moves across the area…Fresh to strong (up to 45 km/h) easterly winds can be expected in exposed areas, with direction occasionally veering to south-easterly by afternoon. A tropical wave should follow quickly across the Eastern Caribbean with a supportive moisture profile throughout the atmosphere. Based on the likelihood for heavy rainfall accumulations